PHP抓取网页内容的技巧分享

如何才能正确的实现可为什么PHP抓取网页内容后没反应呢？连测试的文字都没有，要是我把echo "测试一下";放到第一行就可以输出，我估计是curl_init()函数还没有运行！

你看看PHP的phpinfo()中有没有CURL扩展支持!

把php_curl.dll拷到c:windows和c:windowssystem32里面 重启apache之后再试试看

不是php_curl.dll这个文件，是把php目录中的libeay32.dll,ssleay32.dll拷到c:windowssystem32里面 重启apache

为了服务器安全着想，所以把allow_url_fopen关掉了。

当服务器allow_url_fopen = Off 时，就不能用file_get_contents，只有设置ＯＮ时可以用。

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php /*  </span></span></span></li>
<li>
<span>$</span><span class="attribute">getstr</span><span>=</span><span class="attribute-value">file_get_contents</span><span>("http://www.<br>163.com/weatherxml/54511.xml");  </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">qx</span><span>=</span><span class="attribute-value">explode</span><span>(""",strstr($getstr,"</span><span class="attribute">qx</span><span>="));  </span>
</li>
<li>
<span>$</span><span class="attribute">wd</span><span>=</span><span class="attribute-value">explode</span><span>(""",strstr($getstr,"</span><span class="attribute">wd</span><span>="));  </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">qximg</span><span>=</span><span class="attribute-value">explode</span><span>(""",strstr($getstr,"</span><span class="attribute">qximg</span><span>="));  </span>
</li>
<li>
<span>$</span><span class="attribute">qximg_</span><span>=</span><span class="attribute-value">explode</span><span>(",",$qximg[1]);  </span>
</li>
<li class="alt"><span>echo "北京 ".$qx[1]."";  </span></li>
<li><span>echo $wd[1];*/  </span></li>
<li class="alt">
<span>//echo "</span><span class="tag"><span> </span><span class="tag-name">img</span><span> </span><span class="attribute">src</span><span>=</span><span class="attribute-value">'http://news.<br>163.com/img/logo/".$qximg_[0]."'</span><span class="tag">><br></span><span class="tag"><span> </span><span class="tag-name">img</span><span> </span><span class="attribute">src</span><span>=</span><span class="attribute-value">'http://news.163.com<br>/img/logo/".$qximg_[1]."'</span><span class="tag">></span><span>";  </span></span></span>
</li>
<li>
<span class="tag">?></span><span> </span>
</li>
</ol>

以下PHP抓取网页内容的范例是通curl_init函数来获取163天气预报

把php.ini里( ;extension=php_curl.dll )　前面的(;)去掉保存

把php_curl.dll,libeay32.dll,ssleay32.dll拷到c:windowssystem32里，重启IIS即可，没有装apache

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php  </span></span></span></li>
<li><span>//初始化curl  </span></li>
<li class="alt">
<span>$</span><span class="attribute">ch</span><span> = </span><span class="attribute-value">curl_init</span><span>() or die (curl_error());  </span>
</li>
<li><span>//设置URL参数  </span></li>
<li class="alt"><span>curl_setopt($ch,CURLOPT_URL,"http:<br>//www.163.com/weatherxml/54511.xml");  </span></li>
<li><span>//要求CURL返回数据  </span></li>
<li class="alt"><span>curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);  </span></li>
<li><span>//执行请求  </span></li>
<li class="alt">
<span>$</span><span class="attribute">result</span><span> = </span><span class="attribute-value">curl_exec</span><span>($ch) or die (curl_error());  </span>
</li>
<li><span>//取得返回的结果，并显示  </span></li>
<li class="alt"><span>//echo $result;  </span></li>
<li><span>// echo curl_error($ch);  </span></li>
<li class="alt">
<span>$</span><span class="attribute">qx</span><span>=</span><span class="attribute-value">explode</span><span>(""",strstr($result,"</span><span class="attribute">qx</span><span>="));  </span>
</li>
<li>
<span>$</span><span class="attribute">wd</span><span>=</span><span class="attribute-value">explode</span><span>(""",strstr($result,"</span><span class="attribute">wd</span><span>="));  </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">qximg</span><span>=</span><span class="attribute-value">explode</span><span>(""",strstr($result,"</span><span class="attribute">qximg</span><span>="));  </span>
</li>
<li>
<span>$</span><span class="attribute">qximg_</span><span>=</span><span class="attribute-value">explode</span><span>(",",$qximg[1]);  </span>
</li>
<li class="alt">
<span>echo "北京 ".$qx[1]."</span><span class="tag"><span> </span><span class="tag-name">br</span><span> </span><span class="tag">/></span><span>";  </span></span>
</li>
<li><span>echo $wd[1];  </span></li>
<li class="alt"><span>//关闭CURL  </span></li>
<li><span>curl_close($ch);  </span></li>
<li class="alt">
<span class="tag">?></span><span> </span>
</li>
</ol>

通过以上对PHP抓取网页内容的学习，大家可以自行实际操作一遍，加深对它的理解。